Maximise the performance of your Miele vacuum by using official Miele Hy Clean 3D Efficiency Dustbags. These dustbags have an Auto shut mechanism which automatically closes the bag when the vacuum is open. This retains more fine dust & small particles than any other conventional dust bag & allows you for vacuum for up to 20% longer before it needs replacing. Suitable for S7 & Dynamic U1 upright vacuum cleaners.